Meausuring QD in win7

[Ao1]

Comp did you run the single ssd via the mobo or via the 9211-8i? If you ran it on the 9211-8i the results would have included unnecessary latency.

I've tried to run the same io config to compare Tilts results with 7 x X25-M's and I am generally faster at qd's below 4. (assuming it was an apples for apples test config). Over and above qd 4 and raid starts to clean up, but as I don't go above qd 2 for the vast majority of times that is irrelevant to me.

Raid 0 is much faster, that is not what I try to discuss. What I try to discuss is what is fastest for desktop users for whom speeds that occur above qd 7 are irrelevant.

From what you have said you can't get above qd 2 for most of the time. I think you will find that does not change if you use a single ssd on ich.

Again, I'm not trying to say raid 0 is not faster. It is, however it is only faster when you get to high enterprise qd's. At low qds it can be slower as you have seen for yourself.

Your results show that scaling is bad at low qd. At qd 8 you are getting 148% extra read speeds by multiplying your ssd's by 8. That is roughly 18% scaling for every ssd that you add and at qd 1 you are actually losing by 7%.

I'm more than happy to run and compare any io config tests that reflects desktop usage patterns (reads and writes at qd's 1 to 7.) if you want to do an apples for apples comparison.